×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

I need a sanity check

I need a sanity check

I need a sanity check

(OP)
Say you've got a fixture on a wing that undergoes a 10g vertical maneuver going through the CG of the fixture, and on the end of the fixture is an object "d" on a linkage distance "a" from the fixture. If you need to use torque to resist that loading scenario the torque required would just be T = 10*Md*g*a, right?

RE: I need a sanity check

What b has to do with your problem?

Does object d can rotate around pin on the plane of the drawing?

If so, is that rotation what you try stopping with a moment applied on the pin?

"Where the spirit does not work with the hand, there is no art." - Leonardo da Vinci

RE: I need a sanity check

(OP)
b is the distance from CG to the end of the fixture.

Yes, object d can rotate around the pin. Lets say you had a motor directly on the pin that reacted to the G forces to keep object d in it's orientation.

RE: I need a sanity check

Hi

I might be misunderstanding the problem but the direction of the forces drawn result in a couple acting around the pin d

if you take moment about pin d then the resisting moment in my mind should be equal to (Md)g*a + 10*b

“Do not worry about your problems with mathematics, I assure you mine are far greater.” Albert Einstein

RE: I need a sanity check

Only correct, IMO, if the CG of item d is exactly at the connection point between it. At the initial point it doesn't matter, but if it moves them the moment would increase or if the bar didn't go vertically up.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources